$200/month would cover many such sessions every month.

The real question is, what does it cost OpenAI? I'm pretty sure both their plans are well below cost, at least for users who max them out (and if you pay $200 for something then you'll probably do that!). How long before the money runs out? Can they get it cheap enough to be profitable at this price level, or is this going to be "get them addicted then jack it up" kind of strategy?

No because open source models are close behind

Compute costs will fall drastically for existing models

But it's likely that frontier models of the future won't be released to the public at all, because they'll be too good

I have yet to see an open model that is close to the previous gen of frontier models.

Benchmarks are one thing, real world performance is very different.